Probably, you havent read with care post n1, these maps, have been changed to use CX pedestrian features in 37xx series. These arent normal CXs.
To show these features you must create the .unl file with notepad and Jetmouse with FID 800, this is mandatory to show them.
In Melbourne rar is present the unlocked 3D map and it's unlocked, no need any tweak, you must create the .unl file for Melbourne.img file.
So copy the Melbourne 2 map in Map folder in sd: Melbourne.img Melbourne.unl (files must be named with the same name,different estension naturally) and the 3D map.
It will show and the unit will ask you if you want to use CX technology features.
In Melbourne Navteq rar I have Navteq files. I checked also Sydney and Adelaide: no problem